EP0777934B1 - Störfeldsicherer näherungsschalter - Google Patents
Störfeldsicherer näherungsschalter Download PDFInfo
- Publication number
- EP0777934B1 EP0777934B1 EP96914975A EP96914975A EP0777934B1 EP 0777934 B1 EP0777934 B1 EP 0777934B1 EP 96914975 A EP96914975 A EP 96914975A EP 96914975 A EP96914975 A EP 96914975A EP 0777934 B1 EP0777934 B1 EP 0777934B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- field sensor
- proximity switch
- accordance
- magnetic field
- fields
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000002452 interceptive effect Effects 0.000 title claims 12
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000013016 damping Methods 0.000 claims description 2
- 235000014676 Phragmites communis Nutrition 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000005300 metallic glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/95—Proximity switches using a magnetic detector
- H03K17/9502—Measures for increasing reliability
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/95—Proximity switches using a magnetic detector
Definitions
- the invention relates to a magnetic field-operated Proximity switches, as used in many areas of technology the contactless introduction and implementation of electrical Switching, control and regulating processes is used.
- Such a proximity switch is for example after training and function described in DE 40 03 426 A1. Accordingly, becomes by means of an amorphous metal body of high permeability HF oscillating circuit pre-damped by eddy current losses an oscillator circuit as a sensor from the magnetic field of an approaching trigger is dampened and this process used to control a downstream switching device.
- The is defined by a changeable magnetic field Actuating sensor of the proximity switch in a special dimension susceptible to interference from any external magnetic fields in its immediate surroundings. Such interference fields occur e.g. on Due to high current strengths, especially with electrical welding equipment on and can control the equipment there deactivate existing sensors in the system.
- EP-A 0 179 384 describes an interference-free magnet-operated proximity switch, at which two sensors are spaced from each other and with a differential circuit are connected; here is the one generated by the machine element to be detected Difference signal greater than the difference signal generated by interference fields.
- the invention is therefore based on the object of a proximity switch of the generic type against the interference secure by magnetic interference fields, which in one operational sequence alternate and occur in between.
- one magnetic field-operated proximity switch according to the generic term of claim 1 provided that the second sensor reacts to intermittent magnetic interference fields and in its activated state the currently existing one Output signal of the switching stage to maintain the the control signal emitted by the function-determining magnetic field sensor leads back to the input of the amplifier stage.
- the interference field to be neutralized is not permanent available, but only intermittently on a currently operated or just unactuated proximity switch effective. This is done by the return of the corresponding Output signal of the switching stage to the input the amplifier stage a superposition of the same with the master signal on the part of the magnetic field sensor in the sense of "conservation" of the latter and at the same time a stabilization the overall function of the proximity switch. It's also one of those secured proximity switch when used in electrical welding equipment regardless of the used Welding current type and control.
- FIG. 1 can be seen from the magnetic field sensor 1 as a function of one provided for this purpose Triggering magnetic field given guide signal via a Amplifier stage 2 fed to a transistorized switching stage 3 and converted by the same into a defined output signal.
- the output potential of the Switching stage 3 by means of a second sensor 4 which is switched on - such as. in electrical welding systems - intermittent occurring external magnetic field reacts to the input the amplifier stage 2 fed back to the side of the Magnetic field sensor 1 fed guide signal by superimposition to preserve and the proximity switch in its respective Make switching state unaffected by the interference field, as long as this exists.
- the magnetic field sensor is involved 1 and in the case of the interference field sensor 4, for example by inductive Sensors, but instead Hall sensors as well, magnetoresistive Sensors or even simple protective tube contacts can occur, the respective monitoring problem and the failure options to be taken into account execution and Determine effort.
- the amplifier stage can also 2 compared to the reaction of the interference field sensor 4 with a signal delay in the direction of switching stage 3 be equipped.
- a magnetic field sensor 1 Several interference field sensors within the same housing 4 can be assigned and if necessary with each other be magnetically shielded.
- the is made by a highly permeable amorphous metal strip 11 pre-damped HF resonant circuit on its active surface 12 of an oscillator circuit 13 as a sensor element of the proximity switch from the (permanent) magnetic field a defined approaching trigger 14 is damped and dampened again when it was removed.
- the interference field sensor 19 on the one Connected to point c instead of point a can already an intermediate signal emitted by the amplifier stage 16 can be used depending on the damping state the sensor level 11 - 15 positive or negative potential to switch back the input of amplifier stage 16.
- Such Measure proves to be advantageous if on the output side self-protecting switching elements are used that for example, in the event of an overload or short circuit, the switching stage 17 lock. Furthermore, it is possible, if necessary to transmit one of the two potentials, for which purpose in the Switching path of the interference field sensor 19 only one accordingly polarized blocking diode 20 needs to be used.
- the interference field sensor 19 can also be the Signal processing signal taken instead of via point b the input of the amplifier stage 16 already at point d a determining potential within the sensor level 11 - 15 to achieve the same effect.
Landscapes
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
- Electronic Switches (AREA)
- Measuring Magnetic Variables (AREA)
Description
Claims (11)
- Störfeldsicherer Näherungsschalter, bestehend aus einem Magnetfeldsensor (1), der über eine Verstärkerstufe (2) auf eine Schaltstufe (3) wirkt und einem weiten Sensor, gekennzeichnet dadurch daß der zweite Sensor (4) auf intermittierend auftretende magnetische Störfelder reagiert und in seinem aktivierten Zustand das niederohmige Ausgangssignal der Schaltstufe (3) zur Aufrechterhaltung des von dem Magnetfeldsensor (1) eingegebenen Leitsignals an den hochohmigen Eingang der Verstärkerstufe (2) zurückführt.
- Störfeldsieherer Näherungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß der Störfeldsensor (4) das Ausgangssignal der Verstärkerstufe (2) je nach dem Dämpfungszustand des Magnetfeldsensors (1) als ein positives oder als ein negatives Potential an den Eingang der Verstärkerstufe (2) zurückschaltet.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß der Störfeldsensor (4) zur alleinigen Rückübermittlung eines positiven oder eines negativen Potentials an den Eingang der Verstärkerstufe (2) mit einer entsprechend gepolten Sperrdiode (20) in Reihe geschaltet ist.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Störfeldsensor (4) das jeweilige Ausgangssignal der Schaltstufe (3) oder der Verstärkerstufe (2) funktionsbestimmend in die Oszillatorschaltung des Magnetfeldsensors (1) einleitet.
- Störfeldsicherer Näherungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß der Magnetfeldsensor (1) als ein von außen entdämpfbarer Schwingkreis einer HF-Oszillatorschaltung ausgebildet ist.
- Störfeldsicherer Näherungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß der oder mehrere Störfeldsensoren (4) als entdämpfbare HF-Oszillatoren ausgebildet sind.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1, 5 oder 6, dadurch gekennzeichnet, daß der Magnetfeldsensor (1) und/oder der bzw. die Störfeldsensoren (4) als Schutzrohrkontakte ausgebildet sind.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1 oder 6 und 7, dadurch gekennzeichnet, daß der oder die Störfeldsensoren (4) auf die mögliche Einfallrichtung von Fremdfeldern ausgerichtet sind.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß der oder die Störfeldsensoren (4) ansprechempfindlicher sind und einen geringeren Schaltverzug als der Magnetfeldsensor (1) aufweisen.
- Störfeldsicherer Näherungsschalter nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß der Magnetfeldsensor (1) und der oder die Störfeldsensoren (4) in einem gemeinsamen Gehäuse zusammengefaßt sind.
- Störfeldsicherer Näherungsschalter nach Anspruch 10, dadurch gekennzeichnet, daß zwischen den einzelnen Sensoren (1, 4) magnetische Abschirmungen vorgesehen sind.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19522668 | 1995-06-22 | ||
| DE19522668A DE19522668C1 (de) | 1995-06-22 | 1995-06-22 | Störfeldsicherer Näherungsschalter |
| PCT/EP1996/001686 WO1997001222A1 (de) | 1995-06-22 | 1996-04-23 | Störfeldsicherer näherungsschalter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0777934A1 EP0777934A1 (de) | 1997-06-11 |
| EP0777934B1 true EP0777934B1 (de) | 2003-03-12 |
Family
ID=7764977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96914975A Expired - Lifetime EP0777934B1 (de) | 1995-06-22 | 1996-04-23 | Störfeldsicherer näherungsschalter |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5811893A (de) |
| EP (1) | EP0777934B1 (de) |
| JP (1) | JPH10504951A (de) |
| BR (1) | BR9606478A (de) |
| DE (2) | DE19522668C1 (de) |
| WO (1) | WO1997001222A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005010692A1 (de) * | 2005-03-09 | 2006-09-14 | Zf Friedrichshafen Ag | Sensoreinrichtung und Verfahren zur Verwendung einer Sensoreinrichtung |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0920038A1 (de) * | 1997-11-25 | 1999-06-02 | Electrowatt Technology Innovation AG | Schaltung zur Überwachung eines Wechselstromschalters |
| US6473652B1 (en) | 2000-03-22 | 2002-10-29 | Nac Technologies Inc. | Method and apparatus for locating implanted receiver and feedback regulation between subcutaneous and external coils |
| US7173455B2 (en) | 2004-06-08 | 2007-02-06 | Transmeta Corporation | Repeater circuit having different operating and reset voltage ranges, and methods thereof |
| US7304503B2 (en) | 2004-06-08 | 2007-12-04 | Transmeta Corporation | Repeater circuit with high performance repeater mode and normal repeater mode, wherein high performance repeater mode has fast reset capability |
| EP2099134B1 (de) * | 2008-03-06 | 2012-05-23 | Pepperl + Fuchs GmbH | Verfahren zum Erkennen eines Vorbedämpfungszustands und induktiver Sensor mit Vorbedämpfungserkennung |
| CN113517676B (zh) * | 2021-05-06 | 2022-10-28 | 东方电子股份有限公司 | 一种轻微故障情景防止工频磁场干扰母线差动保护的方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4583006A (en) * | 1983-06-09 | 1986-04-15 | Toshio Okada | High frequency oscillation type proximity switch |
| DE3438120A1 (de) * | 1984-10-18 | 1986-04-24 | Gebhard Balluff Fabrik feinmechanischer Erzeugnisse GmbH & Co, 7303 Neuhausen | Stoerfeldfester naeherungsschalter |
| DE3544809A1 (de) * | 1985-10-02 | 1987-04-02 | Turck Werner Kg | Magnetfeldabhaengiger, elektronischer annaeherungsschalter |
| DE3616389A1 (de) * | 1986-05-15 | 1987-11-19 | Turck Werner Kg | Beruehrungslos wirkender naeherungsschalter |
| DE3632624C1 (de) * | 1986-09-25 | 1988-03-10 | Balluff Gebhard Feinmech | Stoerfeldunempfindlicher Naeherungsschalter |
| DE3704893A1 (de) * | 1987-02-17 | 1988-08-25 | Turck Werner Kg | Anordnung fuer naeherungsschalter zum schutz gegen signalverfaelschung durch magnetische wechselfelder |
| JPH0812994B2 (ja) * | 1988-09-22 | 1996-02-07 | 三菱自動車工業株式会社 | 自己診断型近接スイッチ |
| DE4003426B4 (de) * | 1989-11-15 | 2005-11-24 | Werner Turck Gmbh & Co. Kg | Magnetfeldabhängiger elektronischer Annäherungsschalter |
| JP3027242B2 (ja) * | 1990-10-04 | 2000-03-27 | ヴェルナー トゥルク ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディトゲゼルシャフト | 誘導近接スイッチ |
| DE9310119U1 (de) * | 1993-07-07 | 1993-09-09 | Werner Turck Gmbh & Co Kg, 58553 Halver | Montagesockel für einen induktiven Näherungsschalter |
| US5517112A (en) * | 1994-11-07 | 1996-05-14 | Allegro Microsystems, Inc. | Magnetic field detector with noise blanking |
-
1995
- 1995-06-22 DE DE19522668A patent/DE19522668C1/de not_active Expired - Fee Related
-
1996
- 1996-04-23 US US08/693,157 patent/US5811893A/en not_active Expired - Lifetime
- 1996-04-23 WO PCT/EP1996/001686 patent/WO1997001222A1/de not_active Ceased
- 1996-04-23 EP EP96914975A patent/EP0777934B1/de not_active Expired - Lifetime
- 1996-04-23 JP JP8528963A patent/JPH10504951A/ja active Pending
- 1996-04-23 BR BR9606478A patent/BR9606478A/pt not_active Application Discontinuation
- 1996-04-23 DE DE59610217T patent/DE59610217D1/de not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005010692A1 (de) * | 2005-03-09 | 2006-09-14 | Zf Friedrichshafen Ag | Sensoreinrichtung und Verfahren zur Verwendung einer Sensoreinrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997001222A1 (de) | 1997-01-09 |
| EP0777934A1 (de) | 1997-06-11 |
| DE59610217D1 (de) | 2003-04-17 |
| BR9606478A (pt) | 1997-12-23 |
| DE19522668C1 (de) | 1996-07-25 |
| US5811893A (en) | 1998-09-22 |
| JPH10504951A (ja) | 1998-05-12 |
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